Lifting-jack.



H. G. KLEIN, SR. & E. R. PENROSE.

LIFTING JACK.

APPLICATION FILED .TUNE 21, 1909.

Patented Oct. 1, 1912.

INVENTOR 5: fg

WITNESSES:

UNITEDv STATES PATENT OFFICE,

HENRY C. KLEIN, SR., AND EDWARD It. PENROSE, 0F LOGANSPORT, INDIANA,ASSIGNORS TO BUDA FOUNDRY &; MANUFACTURING COMPANY, OF CHICAGO,ILLINOIS, A CORPORATION 0F ILLINOIS.

LIFTING-JACK;

Specification of Letters Patent.

Patent-ed Oct 1, 1912.

Application led June 21, 1908. Serial No. 503,393.

To all whom 'it may concer/n: Y

Be it known that we, HENRYl C. KLEIN,

standard when they are raised tothe normal limit of their movement andthereby to avoid injury to the jack and also to safeguard the user andthe load lifted from injury owing to canting of the jack relatively tothe load or collapse of the jack; to provide a jack of the characterdescribed wherein the strain both upon the shell or cap and upon thestandard will he equalized, that is to say wherein such strain will beborne equally by all parts of the periphery of both members in equalproportlons; to improve and simplify the construct-ion of jacks 4of thecharacter referred to, and' to produce a jack which may be mosteconomically produced and rapidly assembled, aswell as one whichwillhave such other 'advantages as will be hereinafter disclosed.

To accomplish these objects and to attain such additional benefits aswill be apparent to those who are skilled in the art to which ourinvention relates, we have provided a construction which is exemplifiedin the wcompanying drawings, wherein- Figure l is a sectional view takenvertically through a lifting jack to which our improvements are applied,such jack being shown in its fully lowered position;

Figure 1 is a similar view taken when the jack 1s at its fully raisedposition, and

Figures 3 and 4 are sectional views of modified forms of construction.

Referring now more particularly to Figures 1 and 2 it will be notedlthat in carrying out our invention weprovide a fixed stand-y ard orsupport 4, preferablymade of cast steel, surrounding which is a liftingshell o'r cap 5 adapted to be moved by means of the raising and loweringscrew 6 whlch has threaded engagement with the'block or nut 7 carried inthe standard 4, said screw 7 being provided with proper driving means,here shown as abevel gear 8 actuated by a bevel gear 9 when power isapplied thereto in the usual ma-nner. To facilitate the op eration ofthe jack under a load, a pair of bearing plates'l() and 11 with a ballretainer and balls 12 arel provided at the upper end of the screw 6, andthe members required for the actuation of the bevel gear 8 are carriedin a plate 13 mounted upon the shell 5, in a manner which in allsubstantial respects is well known to those who are versed in themanufacture or use of lifting jacks.

To limit the upward movement of the shell 5 relatively to the standard 4however, we provide the shell 5 with an annular viia'nge 14 whichpreferably extends around the entire inner circumference ofthe shell 5,and provide the upper end of the standard 4 with a projecting collar orrim 15 to the end that when the projection 14 contacts with the collar15, ('see Figure 2) further upward 'movement of the shell 5 and stem 61s prevented.

As illustrated in Figures 1 and 2, the projection 14 may be madeintegral with the shell 5, and the collar 15 screw threaded to thestandard 4, by a screw working in a direction opposite to that of thescrew 6, so that any tendency to loosen or unscrew will be avoided,though for further protection a pin as indicated at 17 may be provided.

In Figure 3 a modified form of construction in which the collar 14 hasscrew threaded engagement with the shell 5, instead of being madeintegral therewith and the collar 15a is made integral with the standard4 instead of separable therefrom as illustrated; In this form ofconstruction t shell may be assembled by passing the standard 4 throughthe shell 5, the outer cap 19 screw threaded to the shell 5 andprevented from rotation relative thereto by the set screw 20 beingremoved, and the foot 18 thereafter attached to the standard 4.

The operation of the lifting jack of our improved construction herewithillustrated will be obvious from a comparison of the position of theparts shown in Figures. 1

and 2.

movable with respect thereto and being internally threaded at thebottom, an externally threaded collarengaging the threaded portion ofthe shell and ada ted to abut the collar on the post, a remova le capportion for closing the upper end of the shell and means for moving theshell with respect to the post.

In testimony whereof We have hereunto signed our names in thepresence ofthe two' subscribed witnesses.

HENRY C. KLEIN, SR. EDWARD R. PENROSE. Witnesses:

FRANK O.v JOHNSON, L.s.] ORPHA CARTER. [L. 5.]

